Question: When will the chairperson for Walgreens, Charles Rudolph Walgreen, Sr., start?
Paraphrase: When did Charles Rudolph Walgreen Sr, the chairperson for Walgreens start?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q1591889 p:P488 ?s . ?s ps:P488 wd:Q5082215 . ?s pq:P580 ?value}